What does 7.5M mean?

7.5M typically means 7.5 million. The "M" is an abbreviation for "million," which is often used in financial contexts, population statistics, and other numerical representations to denote large quantities in a concise manner. For example, 7.5M could refer to a sum of money, such as $7.5 million, or a count of people, such as a population of 7.5 million individuals.